<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>向 set 中添加多个元素</title>
</head>
<body>
    <script>
        var num=new Set([1,2,3,4,5,6,7])
        num.add(10).add(45)
        console.log(num)
    </script>
</body>
</html>